Gum-pencil.



onrrnn snares Parana ca ries WILHELM EBHARDT, OEVIENNA, AUSTRIA-HUNGARY.

Patented Mar. 11, 1913.,

GUM-PENCIL.

1,055,454, Specification of Letters Patent.

' N Drawing.

Application filed March 9, 1910. Serial No. 548,220.

To all whom it may concern Be it known that I, WILHELM EBHARDT, a subject of the Emperor of Austria-Hungary, residing at Vienna, Austria-Hungary, have invented new and useful Improvements in Gum-Pencils, of which the following is a specification. My invention relates to pencils, and a PI'lmary object is to provide a gum-pencil of' the composition hereinafter claimed.

Gum-pencils of the kind to which my invention relates are particularly for gum- Imng paper, and they consist of a dried adhesive substance brought int-o'the form of a rod and of such composition that either only the part of the paper Whichis to be gummed 1s moistened and has passed over it the dry pencil, or the pencil is moistened and passed over the dry paper.

An adhesive substance suitable for manufacturing such a pencil consists of a mixture of gum, citric acid, chlorid of calcium and preferably potassium chromate. The latter accelerates the hardening of the mass, guarantees its holding together and causes the pencil to dry rapidly after the same has been moistened. After being mixed together the mentioned constituents are mixed with pure alcohol and the mass thus obtained is then pressed into the form of a rod or pencil and dried. The pencils thus obtained are cut, polished and wrapped in tin-foil.

The following may serve as an example of aparticular composition suitable for use in my pencils: 70% best white Kordofan gum, 12% powdered gum arabic, 8% citric acid,

4% calcium chlorid, 6% potassium chromate.

Kordofan gum is a natural gum resulting from the drying of the exuded sap of the gum acacia trees found in Kordofan, Africa.

Such pencils maybe carried in the pocket and are always ready for use.

I claim 1. As a new article of manufacture, a gum-pencil of the character described, the

constituent vsubstances of which are gum,

WILLY EBHARDT.

Witnesses PETER ERTZVOIR, AUGUST FUGGER. 

